The manfrotto 500 pro fluid video head with flat base is a lightweight head with large platform base and is suitable for hdslrs weighing no more than 5kg the side lock system allows the camera and sliding qr quick release plate to click quickly into the head from above instead of needing to be aligned and slid in from the back the 500 has a pre set counterbalance of 24kg but is able to support equipment of up to 5kg the 500 has one easy link 38 connector to allow an external monitor or